Pressure gauge



5mm, 192s. 1,460,249

H. P. KRAFT PRESSURE GAUGE Filed May 2 1919 INVENTOR By Attorneys,

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Wotented done 2%, lld di U'hllllhh dllihll hd PATENT PEEEQUEE GAUGE Application one may it,

To all whom it may concern:

Be it lrnown thut 1, Humor P. Knew, u citizen oi the United States of Americe, residing ut Ridgewood, in the county oi Bergen end Stete of New Jersey, have invented certuin new end useful improvements in Pressure Gauges, of which the following is u specification.

This invention reletes to pressure guuges, end sinus to provide certuin improvements therein.

T he invention is purticulerly directed to e gouge for measuring eir pressures, such us in pneumatic tires or the like, end more especially to the type of gouge wherein moons ere rovided for holding the indiestion efter t e pressure is removed from the gauge. The invention is host epplied to u. gauge of the dial type operated by e. Bourdon-tube or equivalent mechanism, the diet or hsnd being rotated by the tube, end left in its indicetlng position otter the tube is retracted.

The invention provides or simple end efiective method of holding the indicator in its indicating position end of restoring the some for the purpose of resetting the gouge. The invention also includes certein other iieotures or improvement which will be hereinstter more fully described.

Referring to the drawings, which illustrute one form of the invention,

Figure 1 is o, face view of the gouge with the dial broken uwuy to disclose the operu-= tive ports.

Fig. 2 is e cross-sectional view of the ports shown in Fig. 1.

Fig. 3 is on enlurged view of some oi the working ports.

Referring to the drawings, let A indicate the huge as a whole which is shown as compris ng u casing B preferably circular in form, on the inside oil which is mounted e hloclr or base C which is adopted to support the Bourdon tube D. Connected with the block or loose C is a foot E which extends downwardly below the exterior of the cusing and which is provided with some form or connection, by means of which it may be attached to the chamber whose pressure is to be ascertained. For use in connection with tires or similar devices the foot E contains e deflating pin F adopted to unseat the check of the tire valve and a packing G which is ode ted to make a tight joint with the end of t e tire valve casing when the no. semi on. corner.

gouge is pressed thereon. A continuous pessege is provided through the defiotor up to the interior of the tube D.

According to the present invention it connection is formed between the end H oi the tube D and the rotary hand I, which prefere'bly includes the resetting device J. in the construction illustreted this resettin device is in the form of u link, one end or is connected with the usual sector K which meshes with the pinion L fixed on the pointer shaft or arbor The other end is preferuhly extended up through the casing and formed with u push handle Q. The end H of the Bourdon tube engages s. shoulder P formed on'the pert J, with the result thet es the tube struightens under pressure, port 5' is raised, thereby moving the sector, and rotating the sheit M end hand I. When pressure is removed from the gauge the tuhe contracts, thus leaving the resetting meinlcer J, together with the sector, pinion, shaft and hand in the positions to which they have been moved by the pressure. To reset the hand, it is only necessary to push inwardly on the handle U which will rotate the sector, pinion and hand in the reverse direction until the zero position is reached. This else restores contuct between the contracted tube and the shoulder P, so that the gauge is then ready for e succeeding operation.

in Fig. 3 is illustruted in detached condition the actuating mecheuisin, including the lower part of the resetting member, the sec tor and pinion. By reference to this construction it will be seen that the resetting mechanism is preferuhl not connected direotly to the sector, but is pivoted to on urrn Q, the opposite end of which has an edjustuhle connection with the sector, as by c. slot formed in one of the ports through which e set screw passes. By this means the necessery adjustments in essembling and use one he easily made.

To introduce a frictional hold upon the mechanism, so that the actuating ports retain their position to which they have heen moved by the pressure, there is preferably provided at spring R which is fixed to u post S, and which bears against the shuft M of the pinion L. This forms u simple and effective method of retaining the hend in its indicating position. A similar spring T may also be provided which bears against till the side of the sector pivot or 1post U. Preferebly u single spring is uti ed for bo h purposes, as shown. The spring T also secures a frictional hold upon the pivot U e I- have shown and described one form of the invention, it will be understood that I do not wish to be limited thereto, since various cha ma be made therein without departing from t spirit of the m vention.

What I claim is g 1. A pressure gauge having a rotary indicating member, pressure responsive means,

' a sector cooperating with said means for rotating said member, means for maintaining said member in pressure indicating position, and manually operable means permanently connected to said sector and extending to the exterior of the gauge for resetting vided with a shoulder adapted to be en- Y dicating member, pressure re said indicating member.

2. A pressure having a rotary innsive means, a sector cooperating with sai means for rotating said member, means for maintaining said member in pressure indicating position,

and means permanently connected to said sector for manually resetting said indicating member, the pressure responsive means comprising a Bourdon' tube, the free end of which engages it in one direction,

3. A pressure gauge or the like, comprisrotary indicating member, a Bourdon resetting device to move mgea tu a sector cooperating with said tube for rotating said indicating member, and a manually operable resetting device extending to the exterior of the gauge, and progaged by the free end of the Bourdon tube to move the resetting device outwardly, said resetting device'being operatively connected with the sector for moving the same.

4. A pressure gauge or the like, having a rotary indicating member, a. Bourdon tube and means associated therewith for rotating the indicating member, said means comprising a link extending to the exterior of the gauge and provided with a shoulder adapted to be engaged by the free end of the Bourdon tube, said link havinga manuallyoperating portion for resetting the indicatmg member.

5. A pressure gauge, or the like, havingtaining said member in indicating position after the premure is released from the gauge,

means comprising a resetting device for rotating the indicating member and pressure responsive means operable upon the means for rotating the indicating member to rotate the same.

7. A pressure gauge, or the like, having an indicating member, a sector, a resetting device, and pressure responsiw'e means operating upon said indicating member through said resetting device and sector, and a single spring directly acting against said'indicating member and said sector to retain the indicating member in pressure indicating position after the pressure is released from the gauge.

In witness whereof, I have hereunto signed my name.

. HENRY P. KRAFT. 

